tardis-dev/dist/realtimefeeds/bitflyer.js

Convenient access to tick-level historical and real-time cryptocurrency market data via Node.js

import { RealTimeFeedBase } from "./realtimefeed.js";
export class BitflyerRealTimeFeed extends RealTimeFeedBase {
    wssURL = 'wss://ws.lightstream.bitflyer.com/json-rpc';
    mapToSubscribeMessages(filters) {
        return filters
            .map((filter) => {
            if (!filter.symbols || filter.symbols.length === 0) {
                throw new Error('BitflyerRealTimeFeed requires explicitly specified symbols when subscribing to live feed');
            }
            return filter.symbols.map((symbol) => {
                return {
                    method: 'subscribe',
                    params: {
                        channel: `${filter.channel}_${symbol}`
                    }
                };
            });
        })
            .flatMap((c) => c);
    }
    messageIsError(message) {
        return message.method !== 'channelMessage';
    }
    onMessage = (msg) => {
        // once we've received book snapshot, let's unsubscribe from it
        if (msg.params.channel.startsWith('lightning_board_snapshot')) {
            this.send({
                method: 'unsubscribe',
                params: {
                    channel: msg.params.channel
                }
            });
        }
    };
}
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